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If you would be kind enough to read the article you will see a link to a video. At approximately the 7 minute 40 second mark they show a glass percolator. If you look in the bottom half you will see already brewed coffee. The already brewed coffee is boiling and being pushed back over the grounds. Say it's not true if you like but that's a pretty good visual demonstration of what is happening. Now on the other hand if you want your coffee to be pushed up into a second chamber by steam and held safely away from boiling that's not a percolator. That is a vacuum pot which is described over here.

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